Pulmonary infarction is most commonly caused by the dislodgement of thrombus emboli in the extra-pulmonary vessels, resulting in pulmonary artery embolism, most commonly left lower extremity deep vein thrombosis, and patients are prone to life-threatening such as respiratory failure and heart failure. The treatment is based on the condition of active anticoagulation and thrombolytic therapy, and thrombolysis can be chosen when there is no contraindication in the acute phase, and interventional and surgical treatment can be used when necessary. During the whole process, appropriate bed rest, a light diet without spicy and stimulating food, emotional stability, and appropriate oxygen, and in severe cases, mechanical ventilation, and pain relief, blood circulation and blood stasis medication. Patients with airway obstruction can be treated with bronchodilators such as salbutamol, terbutaline and aminophylline. Patients with heart failure and shock should be treated with blood volume and effective circulation, and vasoactive substances such as dopamine and cardiotonic drugs.